Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

Pressures, checking on vehicles
Página 29 de 33
specification
- High and low pressure normal at
first, after some time high pressure
increases above specification.
- Activation of A/C Compressor
Regulator Valve N280
malfunctioning
- Check activation of
Compressor Regulator Valve
N280 .
- After a time, low pressure drops
to value in graph or below.
- Required cooling output is no
longer attained.
- High and low pressure normal at
first, after lengthy driving time, low
pressure drops below specification
(evaporator ices up).
Note:
- If problem involving moisture in
refrigerant circuit only occurs after
a lengthy operating period or only
infrequently (low pressure drops
below specification and evaporator
ices up), it is sufficient to replace
the dryer in the receiver. Adjust
quantity of refrigerant oil.
Refrigerant circuit is then to be
evacuated for at least 3 hours.
- It is not initially necessary to
flush the refrigerant circuit with
compressed air and nitrogen when
this problem occurs since
normally, there is only a small
quantity of moisture in the system
which can be removed by lengthy
evacuation.
- With this malfunction, evaporator
may ice up although quantity of
refrigerant in circuit is OK.
- Moisture in refrigerant circuit - Discharge refrigerant circuit.
- Flush refrigerant circuit with
compressed air and nitrogen.
- Replace receiver with dryer.
- Evacuate refrigerant circuit fo
least 3 hours.
- Re-charge refrigerant circuit.
- Repeat test.
Possible deviation from
specification
Possible cause
Corrective action
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13/2/2005